MAZ21200AG Equivalent & Substitute Parts

Part Overview

The MAZ21200AG is a 12 V, 1 W Zener diode manufactured by Panasonic Electronic Components in the DO-41 axial through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	12 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	8 Ohms
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Current - Reverse Leakage @ Vr	5 µA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA

Substitute Part Grouping Explanation

Substitution of the MAZ21200AG is determined by the following critical parameters:

Zener Voltage (Vz): Must be 12 V nominal
Power Rating: Minimum 1 W; higher ratings are acceptable
Tolerance: ±5% required
Package Type: DO-41 or DO-204AL (equivalent axial through-hole packages)
Mounting Type: Through hole configuration
Impedance: Maximum 9 Ohms acceptable

Substitute parts are grouped into two categories based on power rating compatibility:

Category 1 - Full Power Rating Match (1 W): Parts with exactly 1 W power dissipation capability, providing direct functional equivalence.

Category 2 - Reduced Power Rating (150 mW): The 1EZ12D5-TP operates at 150 mW, which is a derated substitute suitable only for applications with reduced power dissipation requirements.

All substitute parts maintain the 12 V zener voltage, ±5% tolerance, and through-hole DO-41 package configuration required for mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power - Max	Tolerance	Zzt (Max)	Package	Product Status
MAZ21200AG	Panasonic Electronic Components	12 V	1 W	±5%	8 Ohms	DO-41	Obsolete
1EZ12D5-TP	Micro Commercial Co	12 V	150 mW	±5%	9 Ohms	DO-41	Active
1N4742A	Lumimax Optoelectronic Technology	12 V	1 W	±5%	9 Ohms	DO-41	Active
1N4742A,113	Nexperia USA Inc.	12 V	1 W	±5%	9 Ohms	DO-41	Active
1N4742A-T50A	onsemi	12 V	1 W	±5%	9 Ohms	DO-41	Active
1N4742AP/TR8	Microchip Technology	12 V	1 W	±5%	9 Ohms	DO-204AL (DO-41)	Active
1N4742ATR	onsemi	12 V	1 W	±5%	9 Ohms	DO-41	Active
BZX85C12	Taiwan Semiconductor Corporation	12 V	1.3 W	±5%	9 Ohms	DO-204AL (DO-41)	Active
BZX85C12-T50R	onsemi	12 V	1 W	±5%	9 Ohms	DO-41	Active

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

The following parts provide direct functional equivalence to the MAZ21200AG with 1 W power rating and active product status:

1N4742A-T50A (onsemi): Active status, ROHS3 compliant, 51,327 units in stock
1N4742ATR (onsemi): Active status, ROHS3 compliant, 42,400 units in stock
1N4742A,113 (Nexperia USA Inc.): Active status, ROHS3 compliant, 25,140 units in stock
1N4742A (Lumimax Optoelectronic Technology): Active status, RoHS compliant, 10,019 units in stock
BZX85C12-T50R (onsemi): Active status, ROHS3 compliant, 1 W rating, 9,757 units in stock

Secondary Substitute (Enhanced Power Rating)

BZX85C12 (Taiwan Semiconductor Corporation): Active status, ROHS3 compliant, 1.3 W rating provides additional thermal margin, 906 units in stock

Derated Substitute (Reduced Power Application)

1N4742AP/TR8 (Microchip Technology): Active status, 1 W rating, 914 units in stock
1EZ12D5-TP (Micro Commercial Co): Active status, 150 mW rating suitable only for low-power applications, 648 units in stock

All substitute parts maintain the 12 V zener voltage, ±5% tolerance, and DO-41 through-hole package required for direct board-level replacement. Selection should prioritize parts with highest inventory availability and compliance certifications matching system requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1EZ12D5-TP replace the MAZ21200AG in all applications?

A: The 1EZ12D5-TP operates at 150 mW maximum power dissipation, compared to the MAZ21200AG's 1 W rating. This part is suitable only for applications with power dissipation below 150 mW. For full 1 W capability, use parts from the primary substitute list.

Q: Are all substitute parts mechanically compatible with the original PCB layout?

A: Yes. All substitute parts use the DO-41 or DO-204AL (equivalent) axial through-hole package with identical lead spacing and mounting configuration. Direct board-level replacement is possible without layout modification.

Q: What is the difference between 1N4742A variants from different manufacturers?

A: The 1N4742A designation is a standard industry part number used by multiple manufacturers. Variants such as 1N4742A-T50A, 1N4742ATR, and 1N4742A,113 differ in packaging format (Cut Tape, Tape & Reel, or Bulk) and manufacturer-specific suffixes, but maintain identical electrical specifications: 12 V, 1 W, ±5% tolerance.

Q: Why does BZX85C12 have a higher power rating (1.3 W) than the original part?

A: The BZX85C12 is rated for 1.3 W maximum power dissipation, exceeding the MAZ21200AG's 1 W specification. This higher rating provides additional thermal margin and is fully compatible for applications requiring 1 W or less. The zener voltage and tolerance remain identical at 12 V ±5%.

Q: What compliance certifications should I verify for my application?

A: Most active substitute parts carry ROHS3 compliance certification. The 1N4742AP/TR8 is marked as RoHS non-compliant. All parts are REACH unaffected and carry EAR99 export classification. Verify specific compliance requirements against your system specifications before final selection.

Q: Can I use the 1N4742AP/TR8 if my design requires RoHS compliance?

A: No. The 1N4742AP/TR8 is explicitly marked as RoHS non-compliant. For RoHS-compliant designs, select from the ROHS3-compliant alternatives: 1N4742A-T50A, 1N4742ATR, 1N4742A,113, or BZX85C12-T50R.

Q: What is the difference between DO-41 and DO-204AL package designations?

A: DO-41 and DO-204AL are equivalent package designations for the same axial through-hole diode package. Both refer to the same physical form factor with identical lead spacing and mounting characteristics. Parts specified as either designation are mechanically interchangeable.

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